Calf collar



FIG. 1 is a front perspective view of a calf collar showing my newdesign;

FIG. 2 is a left rear perspective view in an open condition thereof;

FIG. 3 is a right rear perspective view in an open condition thereof;

FIG. 4 is a top plan view in an open condition thereof; and,

FIG. 5 is a front elevational view thereof.

The broken line elements are not claimed.

The bottom view is not ornamental.

The ornamental design for a calf collar, as shown and described.